Temporally Enabling Dynamic Segmentation for GIS-T

Author: Bo Guo
Organization: Maricopa County

2901 W Durango St
Phoenix,, AZ 85009
USA

Phone: 602-506-7185
Fax: 602-506-8594
boguo@mail.maricopa.gov

As early as the 1970s, researchers found ways of incorporating temporal design schemes into nonspatial databases. These efforts have provided us with many temporally enabled database applications. However, in GIS communities, research on temporal-spatial modeling is still in its infancy. In the field of GIS in transportation, where dynamic segmentation is the core technology, methods are necessary to address the temporal-spatial maze. This maze is further complicated by the inherent separation of feature data from the route network data, as required by the dynamic segmentation database technology.

After a comprehensive review of temporal elements for both spatial and nonspatial databases, the presentation will first focus on exploring segments through tools such as traversal-time diagrams. The presentation will then attempt to address the application of spatiotemporal segmentation in roadway inventory management systems. Here, real-world examples will be given, applying different types of spatiotemporal segmentation operations. Finally, attempts will be made to formally design the spatiotemporal join and outer join operations, which are fundamental to the temporal dynamic segmentation for transportation or utility networks.

As part of the presentation, related features in a GIS-T prototype built upon this technology will be demonstrated. The application is built upon Visual Basic and MapObjects. The backend database is MS SQL Server.